Stuck describes something that's frozen or fixed in one place and can't be moved. If your foot gets stuck in the mud, it means you can't get your foot out of its messy trap.
The lid of a jar can be stuck, and your car can get stuck in traffic; either way, the thing that's stuck isn't going anywhere. You can also use stuck when you can't figure out what to do: you can be stuck on an especially hard math problem or feel stuck in a complicated relationship. The verb stick comes from the Old English stician, pierce or remain fastened.
